135/2015

Maximum: 100 marks Time: 1 hour and 15 minutes
1. In a slip ring induction motor slip rings are connected to the:

Rotor Stator


Exciting field Centrifugal switch


2. Which motor is used for electric traction?

DC compound motor Three phase induction motor


DC series motor DC shunt motor


3. How many slip rings are there in a slip ring induction motor?

4 6
4. Thestatorwindingofa3 ¢ slipring·inductionmotorhas4poles,How manynumberofpoles in the rotor winding?

2 4


6 8


5. Which type of capacitor is used in single phase capacitor type motor?

Ceramic capacitor Mica capacitor


Electrolytic capacitor Paper capacitor


6. What is the effect of single phasing in 3 ¢ induction motor while running?

The motor will not run Burn out due to overheating


No change in running Will make humming noise


7. What is the maximum safe temperature of class E insulation?

90°C 130°C


120°C 150°C


A 3

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8. Which type of insulation tape is not suitable for insulation purpose?

Varnished cambric tape Plastic tape


Rubber tape Friction tape


9. Which of the following motor does not have a winding or commutator or brush is?

DC shunt DC shunt motor Stepper motor


Slip ring induction motor Universal motor


10. Which colour is recommended for earth connection?

Red Black


Green . Blue


11. Which one is the proper location for mounting main switch gear in a building?

In middle position of the building


Separate room under stair case


Accessible place near the termination of service line


Near the gate


12. What is the unit of work done in SI units?

Erg KG Meter


Dyne Joule


13. The power factor of a purely resistive circuit is

Leading Zero


Unity Lagging


14. An alternating current or voltage is that which:

Changes direction only


Changes magnitude only


Changes both magnitude and direction


None of the above


15. Primary winding of a transformer:

Is always a high voltage winding Is always a low voltage winding


Could either low voltage or high voltage None of these


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16. Megger is used to measure

Earth resistance Insulation resistance


Break down voltage of installation None of these


17. Moving iron type instruments are used on

AC supply only DC supply only


Both AC and DC None of these


18. Normally the moving iron instruments are provided with:

Eddy current damping Air friction damping


Fluid friction damping None ofthese


19. The gas inside the inner discharge tube of a sodium vapour lamp is

Argon Neon


Helium Hydrogen


20. Alternators are usually designed to generate:

Variable frequencies Definite frequency


Definite current Definite power


21. When the speed of the alternator increases the frequency:

Increases Decreases


Remains constant Changes


22. In AC circuit the ratio of KW/ KVA represents

Form factor Power factor


Load factor None of these


23. The reactance of a 2H choke coil at 100 Hz is

100Q 216 Q


718Q 1256 Q


24. The path of the magnetic flux in a transformer has:
Low resistance High resistance
Low reluctance High conductivity
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25. The instrument used for measuring a resistance of 100M n is

Ohm meter Megger


Multi meter VTVM


26. Which ofthe following meters has the best accuracy?

Moving iron meter Moving coil meter


Rectifier type Thermocouple meter


27. What is the recommended maxirrlUm pre heating temperature allowed in winding?

60°C 75°C


90°C 100°C


28. The frequency generated by a 8 pole alternator rotating at 600 rpm will be

20Hz 40Hz


60Hz 80Hz


29. As compared to an amplifier,. a transformer cannot

increase output power increase output voltage


increase output current none of three


30. Which of the following is known as metal rectifier:

Gas tube diode Silicon diode


Copper oxide diode All of the above


31. A single machine which can generate AC or DC as well as AC and DC both is called

MG set Synchronous motor


Inverter Rotary converter


32. The commercial unit of Electrical energy is

Joule Kilo watt hour


Watt· hour Ampere hour


33. How many number of positive and negative plates are placed in a 9 plate lead acid cell?
4 positive plate and 4 negative plate 5 positive plate and 4 negative plate
5 positive plate and 5 negative plate 4 positive plate and 5 negative plate 135/2015 6A
34. The unit of resistivity is

0 Olm


Om mho


35. The resistance of a perfect insulator is

Zero 10


20MO Infinity


36. The form factor is the ratio of

Average value to rms value Rms value to average value


Peak value to rms value None


37. Unit of flux density

Weber Tesla


AT/m HIm


38. The basic principle of electromagnetic induction is

Fleming's left hand rule Steinmetz law


Ohm's law Faraday's law


39. Which one of the following in which instruments is used for measuring specific gravity?

Lactometer Barometer


Voltmeter Hydrometer


40. Electrolyte used in nickel iron cell is

Dil.HCI Dil.H2S04


NAOH KOH


41. A semiconductor in it's purest form is known as

Super conductor Extrinsic conductor


Insulator Intrinsic conductor


42. For a silicon PN junction the barrier potential is about:
O.7V O.OOIV
O.07V l.7V A 7 135/2015
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43. The minimum number of diodes needed for a bridge rectifier is

one two


four eight


44. The insulating material belongs to class B insulation is

Mica Cotton


Silicon Leatheroid paper


45. The unit of self induction is

Weber Henry


Volt Coulomb


46. 3 phase star connection:

IL is less than IPh IL=..J3 IPh


IL more than IPh IL=IPh


. 47. Hysteresis is the phenomenon of in a magnetic circuit.

Lagging B behind H Lagging H behind B


Setting up constant flux None of these


48. The maximum current that can pass through a 20 2 watts resister will be:

1 Amps 2 Amps


3 Amps 4 Amps


49. The insulation resistance of an electrical machine working at medium voltage should not be less than

10000 100000


100000 0 1000000 0


50. Distribution transformer are designed to have maximum efficiency nearly:

At any desired load At full load


At50%of full load At no load


51. To a condenser AC supply is given:
The current will not flow There is no continuous flow ofcurrent
The current flows continuously None of the above 135/2015 8A
52. In which type of DC Motor, Two point starter is used?

Series motor Shunt motor


Long shunt compound motor Short shunt compound motor


53. What is the SWG of copper earth conductor ifthe maximum circuit current is 15?

No. 14 No. 10


No. 12 No.8


54. What is the effect of single phasing in three phase induction motor?

Motor will not run Burnt due to overheating.


No change in running Will make humming noise


55. What will happen to the universal motor when it is started without load?

It will not run Run with very low speed


Run with very high speed Run with normal speed.


56. Among the following which device cannot be used as a safety device?

Fuse Earth tester


Circuit breaker ELCB


57. Which type of DC generator is used for battery charging?

Cumulative compound generator Shunt generator


Differential compound generator Series generator


58. What is the thickness of copper plate used for earth electrode?

6.3mm 3mm


3.3mm 3.15 mm


59. The core loss in a transformer is constant during:

Quarter load Halfload


Full load All load


60. The equivalent resistance of the parallel circuit is than the smallest single resistance:
Greater Smaller
Equal Half A9 135/2015
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61. Which is the working principle of an instrument transformer?

Self-induction Lenz' slaw


Mutual induction Fleming's Right hand rule


62. Switch board is fixed at a height per IE rules.

1.5 M .2.5M


2M 3M


63. The rating of fuse is expressed in terms of:

KVA Current


Voltage None


64. A lead acid cell is rechargeable because:

It is a wet cell


Its electrolyte has high specific gravity


Its chemical reaction is reversible


Its electrolyte is H2S04


65. Breather De-hydrating material

Copper sulphate Sodium chloride


Calcium chloride Sodium silicate


66. Instruments which must not be used in the circuit when the power is ON are:

OHM meter and Megger


Phase sequence meter and energy meter


Frequency meter and tong tester


Watt meter and PF meter


67. Which of the following can be called as integrating instrument?

Volt meter Watt meter


Power factor meter Energy meter


68. Buchholz's relay is

Current sensitive device A frequency sensitive device


A gas actuated device Voltage sensitive device


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69. Capacitance is not affected by

Plate area Distance between plates


Di-electric material Frequency


70. The back emf of a DC motor depends on the:

Shape of conductors Field flux


Type of commutator Brush material


71. The flux of a DC motor approaches zero, its speed will approaches

Infinity


Zero


A stable value nearer to the rated speed


None of the above


72. In Scott connections the teaser transformer has tapping on

86.6 of primary 58% of primary


58% of secondary 50% of secondary


73. If a six nos of lamps are to be installed in Godown wiring we require

One SPT and 6 two way switches Two SPT and 6 two way switches


One SPT and 5 two way switches Two SPT and 5 two way switches


74. In small capacity DC machines the yoke is made up of:

Cast iron Brass


Fabricated steel Aluminum


75. Soldering is done on joints to improve:

Tensile strength Conductivity


Resistivity Ductility


76. Short circuited field coils are located effectively by the use of a Mega Ohin meter Growler Ohm meter' Clamp on meter
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77. The body resistance value of a human being with normal health is about:

20 kilo ohm 30 kilo ohm


1 kilo ohm 5 kilo ohm


78. One lamp can be controlled from five location by using intermediate switches and two way switches.How many number of intermediate switches and two way switches are require to control a lamp from 5 positions?

Intermediate switches 2 and two way switches 3


Intermediate switch 4 and two way switches 1


Intermediate switch 1 and two way switches 4


Intermediate switch 3 and two way switches'2


79. What happen ifthe output filter capacitor is opened in a battery charger?

It will not work Make humming noise


High output Take more output current


80. The metal used for the control spring in an electrical instrument is

Steel Nichrome


Hard drawn copper Phosphor bronze


81. Who presided the Congress Session held at Belgarm in 1924?

Jawaharlal Nehru Mahatma Gandhi


Subash Chandra Bose Tilak


82. One of the conditions required for maintaining National Party Status is among three states a party should win at least:

10 seats 11 seats


12 seats 13 seats


83. Which river is known as "Ganga of the South"?

Godavari Mahanadi


Krishna Kaveri


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84. The Secret Code of Germany to attack Russia in second world war:

Little Boy Operation Sea


Lend Lease Operation Barbarosa


85. The upper most solid layer of the earth:

Biosphere Atmosphere


Hydro sphere Lithosphere


86. Who won the Pulitzer Prize on poetry in 2014?

Vijay Seshadri Gobind Beharilal


Geetha Anand Mahmood Darwish


87. Whose goal is selected goal ofthe 2014 FIFA World Cup Brazil?

Lionel Messi James Rodriguez


Gotze Christine Ronald


88. Which countries share border with

Syria -Egypt Labanon -Isarel


Israel-Egypt Syria -Iraq


89. Overall GDP growth of India during 2013-2014

Less than 5 to


8 to 10% Above 10%


90. Who is known as "Vidhyadhiraja"?

Vaghbhatananda Chattampi Swamikal


Sree Narayana Guru Ayyankali


9l. The background of the novel 'The Kite Runner' took place in which country

Iraq Sudan


Syria Afghanistan


92. Venue of the Samadhi of Sree Narayana Guru:

Sivagiri Arunipuram


Varkala Alway


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93. The Wagon tragedy was related to:

Quite India Movement Non Co-operation Movement


Malabar Rebellion Khilafath Movement


94. Spiritual father of Indian National Movement:

Vivekananda Rajaram Mohan Roy


Dayananda Saraswathi Ramaswami Naikkar


95. Which neighboring country sharing longest boundary with India?

China Bangladesh


Pakistan Nepal


96. World Health Organization warns against new epidemic broke out at West Africa in 2014

AIDS Dengue fever


MERS Ebola


97. The author of the Sree Budha Charitham

Kalidasan Cherusseri


Kumaranasan Changapuzha


98. The Period of 11th five year plan:

2007-2012 2006·2011


2005-2010 2008-2013


99. Gandhiji entered Indian politics in connection with:

Rowlat Act agitation Khilafath movement


Non -Co operation movement Lucknow-Pact


100. India govt plan to construct new corridor for high speed train with speed range 300-350 kmph. What is the present maximum speed oflong distance train in India?

100-120 kmph 70-80 kmph


90-100 kmph 80-90 kmph


135/2015 14 A